package com.yupi.yupicturebackend.manager.upload;

import cn.hutool.core.io.FileUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.http.HttpResponse;
import cn.hutool.http.HttpStatus;
import cn.hutool.http.HttpUtil;
import cn.hutool.http.Method;
import com.yupi.yupicturebackend.exception.BusinessException;
import com.yupi.yupicturebackend.exception.ErrorCode;
import com.yupi.yupicturebackend.exception.ThrowUtils;
import org.springframework.stereotype.Service;

import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Arrays;
import java.util.List;
@Service
public class UrlPictureUpload extends PictureUploadTemplate{
    final List<String> ALLOW_FORMAT_LIST = Arrays.asList("jpeg", "jpg", "png", "webp");
    @Override
    protected void processFile(Object inputSource, File file) {
        String fileUrl = (String) inputSource;
        // 下载文件到临时目录
        HttpUtil.downloadFile(fileUrl, file);
    }

    @Override
    protected String getOriginalFilename(Object inputSource) {
        String  fileUrl=(String) inputSource;
        return  FileUtil.mainName(fileUrl)+"."+FileUtil.getSuffix(fileUrl);


    }

    @Override
    protected void validPicture(Object inputSource) {
        String  fileUrl = (String) inputSource;
        ThrowUtils.throwIf(fileUrl == null, ErrorCode.PARAMS_ERROR, "文件不能为空");
        //验证URL格式
        try {
            new URL(fileUrl);
        } catch (MalformedURLException e) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "文件地址格式不正确");
        }
        //验证URL协议
        ThrowUtils.throwIf(!fileUrl.startsWith("http://")&&!fileUrl.startsWith("https://"), ErrorCode.PARAMS_ERROR, "仅支持 HTTP 或 HTTPS 协议的文件地址");
        //发送HEAD请求验证文件是否存在
        HttpResponse response=null;
        try{
            response= HttpUtil.createRequest(Method.HEAD, fileUrl).execute();
            if(response.getStatus()!= HttpStatus.HTTP_OK){
                return;
            }

            //校验文件类型
            String contentType = response.header("Content-Type");
            if(StrUtil.isNotBlank(contentType)){
                //允许图片类型
                final List<String> ALLOW_CONTENT_TYPES = Arrays.asList("image/jpeg", "image/jpg", "image/png", "image/webp");
                ThrowUtils.throwIf(!ALLOW_CONTENT_TYPES.contains(contentType.toLowerCase()),  ErrorCode.PARAMS_ERROR, "文件类型错误");

            }
            //校验文件大小
            String contentLengthStr = response.header("Content-Length");
            if(StrUtil.isNotBlank(contentLengthStr)){
                long contentLength = Long.parseLong(contentLengthStr);
                final long TWO_MB=  1024*1024*2L;
                ThrowUtils.throwIf(contentLength>TWO_MB, ErrorCode.PARAMS_ERROR, "文件大小不能超过2M");

            }
        }finally {
            if(response!=null){
                response.close();
            }
        }


        }

}
